package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 数据统计
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;
    /**
     * 统计指定时间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //返回的数据是datalist和turnoverList

        //1.处理dateList数据
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);       //把第一天放进去，一直放到最后一天
        while (!end.equals(begin)){//日期计算：把begin一天一天往后挪，只要没到最后一天就一直挪
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //2.处理每天对应营业额数据
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据，营业额是指:状态为"已完成"的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where ordertime>begintime and ordertime<endtime and status=5
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover =orderMapper.sumByMap(map);
            //如果没有符合条件的订单查询出来的turnover就为空，就把营业额转成0.0，java.lang.Double其实只是DB查出数据的包装类型
            turnover =turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        //3.封装返回结果
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 统计指定时间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //1.处理dateList数据
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);       //把第一天放进去，一直放到最后一天
        while (!end.equals(begin)){//日期计算：把begin一天一天往后挪，只要没到最后一天就一直挪
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        //2.处理每天存放新增用户数量
        List<Integer> newUserList = new ArrayList<>();
        //3.处理每天存放总用户数量
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);//起始时间
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);  //截止时间

            Map map = new HashMap<>();
            map.put("end",endTime);
            //查询每天用户总数量
            Integer totalUser = userMapper.countByMap(map);//select count(id) from orders where createtime >begintime and createtime< endtime
            newUserList.add(totalUser);

            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);//select count(id) from orders where createtime< endtime
            totalUserList.add(newUser);
        }

        //4.封装数据
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 统计指定时间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //1.处理dateList数据
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);       //把第一天放进去，一直放到最后一天
        while (!end.equals(begin)){//日期计算：把begin一天一天往后挪，只要没到最后一天就一直挪
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();

        //2.每日订单数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

//            select count(id) from orders where order_time <end and order_time>begin
            Integer orderCount = getOrderCount(beginTime, endTime,null);
            //3.每日有效订单数
//            select count(id) from orders where order_time <end and order_time>begin and status=5
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //4.计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //5.计算时间区间内的有效订单总数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //6.计算订单完成率
        Double OrderCompletionRate = 0.0;
        if(totalOrderCount !=0){
            OrderCompletionRate = validOrderCount.doubleValue()/totalOrderCount;
        }

        //7.封装数据
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(OrderCompletionRate)
                .build();

    }

    /**
     * 统计指定时间内的订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount (LocalDateTime begin, LocalDateTime end ,Integer status){
        Map map=new HashMap<>();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }

    /**
     * 统计指定时间内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        //1.查出销量排名top10
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        //2.把数据转成vo里的
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }


    /**
     *  导出指定时间内的运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据(起始时间-结束时间)
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.将查询到的运营数据写入模板文件
            // 获得这个类对象，获得类加载器，从类路径下读取资源返回一个输入流对象
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //（1）填充概览数据
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel=new XSSFWorkbook(in);
            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间:"+dateBegin+"至"+dateEnd);
            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row= sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());


            //（2）填充明细数据
            for(int i=0;i<30;i++){
                LocalDate date =dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3.通过输出流将Excel下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
